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<h1 id="seo-header">一次 Debian Linux 环境下 RAID0 掉盘的数据恢复记录</h1>
<div class="markdown-body">
<h2 id="症状"><a href="#症状" class="headerlink" title="症状"></a>症状</h2><p>重启后，RAID0 所对应的分区无法访问，显示丢失超级块 missing superblock.</p>
<p>由于是刚上线的新项目，还没有开始备份，但是已有部分重要代码，如果找不回来等于损失半个月的工作量.</p>
<p>经检查硬盘S.M.A.R.T状态正常，四块硬盘都是正常识别，也没有坏块，但是对应R0的分区无法读取.</p>
<span id="more"></span>
<h2 id="环境"><a href="#环境" class="headerlink" title="环境"></a>环境</h2><p>系统: Debian 10</p>
<p>CPU: Intel Xeon E5-2699 v3 *2</p>
<p>RAM: 256GB DDR4</p>
<p>阵列状态: RAID0 (Sandisk Extreme Pro 480G SSD *4) RAID1 (希捷 1TB HDD + 西部数据 1TB HDD)</p>
<p>阵列类型: 软件(Software)</p>
<h3 id="处理过程"><a href="#处理过程" class="headerlink" title="处理过程"></a>处理过程</h3><ol>
<li>直接重新挂载，失败，丢失超级块。</li>
<li><code>fsck</code> 修复，无效。</li>
<li>对四块硬盘做镜像后重建阵列，失败。</li>
<li>以相同信息新建阵列，无法进行操作，必须格式化。</li>
<li>这时候已经束手无策了，只能考虑磁盘恢复软件。</li>
</ol>
<h3 id="Testdisk"><a href="#Testdisk" class="headerlink" title="Testdisk"></a>Testdisk</h3><p>经过广泛的尝试和搜索，找到了这样一个工具 <code>testdisk</code></p>
<h4 id="安装"><a href="#安装" class="headerlink" title="安装"></a>安装</h4><p>输入命令</p>
<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><code class="hljs shell">apt install -y testdisk<br><span class="hljs-meta prompt_"># </span><span class="language-bash">运行</span><br>testdisk<br></code></pre></td></tr></table></figure>
<p>运行后界面</p>
<figure class="highlight vhdl"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br></pre></td><td class="code"><pre><code class="hljs vhdl">TestDisk <span class="hljs-number">7.0</span>, Data Recovery Utility, April <span class="hljs-number">2015</span><br>Christophe GRENIER <grenier@cgsecurity.org><br>http://www.cgsecurity.org<br><br><br>TestDisk <span class="hljs-keyword">is</span> free data recovery software designed <span class="hljs-keyword">to</span> help recover lost<br>partitions <span class="hljs-keyword">and</span>/<span class="hljs-keyword">or</span> make non-booting disks bootable again <span class="hljs-keyword">when</span> these symptoms<br>are caused by faulty software, certain types <span class="hljs-keyword">of</span> viruses <span class="hljs-keyword">or</span> human <span class="hljs-literal">error</span>.<br>It can also be used <span class="hljs-keyword">to</span> repair some filesystem errors.<br><br>Information gathered during TestDisk <span class="hljs-keyword">use</span> can be recorded <span class="hljs-keyword">for</span> later<br>review. <span class="hljs-keyword">If</span> you choose <span class="hljs-keyword">to</span> create the <span class="hljs-literal">text</span> <span class="hljs-keyword">file</span>, testdisk.log , it<br>will contain TestDisk options, technical information <span class="hljs-keyword">and</span> various<br>outputs; including any folder/<span class="hljs-keyword">file</span> names TestDisk was used <span class="hljs-keyword">to</span> find <span class="hljs-keyword">and</span><br>list onscreen.<br><br><span class="hljs-keyword">Use</span> arrow keys <span class="hljs-keyword">to</span> <span class="hljs-keyword">select</span>, <span class="hljs-keyword">then</span> press Enter key:<br>>[ Create ] Create a <span class="hljs-keyword">new</span> log <span class="hljs-keyword">file</span><br> [ Append ] Append information <span class="hljs-keyword">to</span> log <span class="hljs-keyword">file</span><br> [ No Log ] Don<span class="hljs-symbol">'t</span> <span class="hljs-keyword">record</span> anything<br> <br></code></pre></td></tr></table></figure>
<p>这里是设置保存日志的地方，一般情况下直接回车选择 <code>Create</code> </p>
<p>接下来会要求选择硬盘，直接选择RAID对应的分区即可.</p>
<figure class="highlight actionscript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><code class="hljs actionscript">TestDisk <span class="hljs-number">7.0</span>, Data Recovery Utility, April <span class="hljs-number">2015</span><br>Christophe GRENIER <grenier@cgsecurity.org><br>http:<span class="hljs-comment">//www.cgsecurity.org</span><br><br> TestDisk <span class="hljs-keyword">is</span> free software, and<br>comes <span class="hljs-keyword">with</span> ABSOLUTELY NO WARRANTY.<br><br>Select a media (<span class="hljs-keyword">use</span> Arrow keys, then press Enter):<br>>Disk /dev/md0 <br></code></pre></td></tr></table></figure>
<p>如果未识别出分区，会要求选择分区表类型，按照个人类型选择即可。</p>
<figure class="highlight pgsql"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre></td><td class="code"><pre><code class="hljs pgsql">TestDisk <span class="hljs-number">7.0</span>, Data Recovery Utility, April <span class="hljs-number">2015</span><br>Christophe GRENIER <grenier@cgsecurity.org><br>http://www.cgsecurity.org<br><br><br>Disk /dev/md0 - * GB / * GB<br> * sectors - sector size=*<br><br>>[ <span class="hljs-keyword">Analyse</span> ] <span class="hljs-keyword">Analyse</span> <span class="hljs-keyword">current</span> <span class="hljs-keyword">partition</span> structure <span class="hljs-keyword">and</span> <span class="hljs-keyword">search</span> <span class="hljs-keyword">for</span> lost partitions<br> [ Advanced ] Filesystem Utils<br> [ Geometry ] Change disk geometry<br> [ <span class="hljs-keyword">Options</span> ] Modify <span class="hljs-keyword">options</span><br> [ Quit ] <span class="hljs-keyword">Return</span> <span class="hljs-keyword">to</span> disk selection<br><br></code></pre></td></tr></table></figure>
<p>选择 Analyse 就会自动分析出分区，如果分析出了你想要的内容，就可以直接按 浏览文件，然后复制到正常的硬盘中。</p>
<p>选择 Advanced 可以恢复已删除的文件系统，按Undelete即可。</p>
<p>由于我已经在实际环境恢复过一遍，剩下的内容就无法演示了。</p>
<h3 id="总结"><a href="#总结" class="headerlink" title="总结"></a>总结</h3><p>Testdisk是强大的数据恢复工具，但是备份才是最重要的，没有人会再想在23点通宵到第二天上午来解决这种数据丢失的问题。</p>
<blockquote>
<p>R0一时爽，数据火葬场</p>
</blockquote>
<p>这次教训后已将阵列修改为RAID10，兼顾速度与安全性，反正又不缺硬盘。</p>
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<p>记得备份!!!</p>
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